CK III - Game crash before Iberia-related decision taken by AI

[Opferlamm]

Short summary of your issue
Game crash before Iberia-related decision taken by AI

Game Version
CK3 1.6.0.1

What OS are you playing on?
Linux

What platform are you using?
Steam

What DLC do you have installed?
Royal Court,

Do you have mods enabled?
Yes

Have you tried verifying your game files (Steam only)?
Yes

How much "pain" is this causing you?
10

Please explain the issue you experienced in the most condensed way possible
Some 400 years into the game, I conquered the first Spanish county (Balearic Islands). After some struggle, a Spanish fleet wants to attack the islands but has not been disembarking for almost 5months. Then suddenly the game crashes to desktop. Going through the error log file, the last action was a "mozarabic" decision by the AI.

Please explain how to reproduce the issue
Start the attached ironman game and wait for 5 ingame days. Game should crash to desktop. (There was a mod installed, but this only plays other music instead of the default ["GoT music collection" mod]).

Is there anything else you think could help us identify/replicate the issue?
Maybe this is related to https://forum.paradoxplaza.com/forum/threads/ck-iii-crash-games.1530564/

The last entries in the log file are:
```
[16:24:20][jomini_script_system.cpp:262]: Script system error!
Error: Failed to fetch a valid faith 'mozarabic_church'
Script location: file: common/achievements/fp2_achievements.txt line: 81
[16:24:20][jomini_script_system.cpp:262]: Script system error!
Error: Failed to fetch a valid faith 'mozarabic_church'
Script location: file: common/decisions/00_major_decisions_iberia_north_africa.txt line: 546
[16:24:20][jomini_script_system.cpp:262]: Script system error!
Error: Failed to fetch a valid faith 'mozarabic_church'
Script location: file: common/scripted_triggers; fp2_struggle_faith_is_mozarabic_trigger line: 3 file: common/decisions/dlc_decisions/03_fp2_decisions.txt line: 807
[16:24:20][jomini_script_system.cpp:262]: Script system error!
Error: Failed to fetch a valid faith 'mozarabic_church'
Script location: file: common/decisions/00_major_decisions_iberia_north_africa.txt line: 546
[16:24:20][jomini_script_system.cpp:262]: Script system error!
Error: Failed to fetch a valid faith 'mozarabic_church'
Script location: file: common/decisions/00_major_decisions_iberia_north_africa.txt line: 701
[16:24:20][jomini_script_system.cpp:262]: Script system error!
Error: Failed to fetch a valid faith 'mozarabic_church'
Script location: file: common/scripted_triggers; fp2_struggle_faith_is_mozarabic_trigger line: 3 file: common/decisions/dlc_decisions/03_fp2_decisions.txt line: 807
```

I have attached a save game
Yes

Upload Attachment
File(s) attached

 

[Opferlamm]

With 1.6.1, the game continues a bit further, but soon after crashes with:

[15:17:26][jomini_script_system.cpp:262]: Script system error!
  Error: Failed to fetch a valid faith 'mozarabic_church'
  Script location: file: common/scripted_triggers; fp2_struggle_faith_is_mozarabic_trigger line: 3 file: common/decisions/dlc_decisions/03_fp2_decisions.txt line: 863